Pneumatic carpet-cleaning device.



No. 862,695. PATENTED AUG. 6, 1907. c. s. BALDWIN.

PNEUMATIC CARPET CLEANING DEVICE. APPLIOIATION FILED sn1= -r.2o.1904.

I UNITED STATES I PATENT f OFFICE.

CHARLES S. BALDWI'N, OF SAN FRANCISCO, CALIFORNIA.

PNEUMATIC CARPET-CLEANING DEVICE.

Specification of Letters Patent.

Patented Aug. 6, 1907.

Application filed September 20, 1904. Serial No. 225,168.

To all whom it may concern:

Be it known that I, CHARLES S. BALDWIN, a citizen of the United States,residing at San Francisco, in the county of San Francisco and State ofCalifornia, have invented new and useful Improvements in PneumaticCarpet-Cleaning Devices, of which the following is a specification. i

This invention relates to improvements-made indevices that operate toremove dust from a carpet by the V application of jets of air to thesurface while the carpet is in place on the floor; and the improvementscomprise a novel construction of easing inclosing one or more nozzlesthrough which jets of air are applied at an angle to the surface of thecarpet, and the dust 'is disl5 charged from the casing by the jointaction of suction and jets of air applied to the dustchamber or receiverall as hereinafter more fully described andpointed out in the claims atthe end of this specification.

The following description explains at length the nature of myimprovements, and the manner in which the same are applied and carriedout; the accompanying drawings forming a part hereof being referred totherein.

Figure 1' is a sectional-view of a carpet-'cleaning device embodying myinvention, the section being taken in a vertical plane transverselythrough 'the casing,-and

. showing the tubes or hose that connect the casing with the pneumaticand the suction appliances of the apparatus. Fig. 2 is'aperspective-view of the device showing one end of the casing broken awayto disclose the internal construction. Fig. 3 is alongitudinal sectionona reduced scale taken through the center of the easin g andhavin'gportions of the pneumatic nozzles broken y- V K The casing a is arectangular box closed on the top,

ends and sides, but openon the bottom. From the in? closed space b,which forms a receptacle or chamber toconfine the dust as it isdislodged from the carpet, an

opening it communicates with a hood e on the top of the easing over theopening. LA-11086 or flexible tube y se- 40 cured to a coupling f on thehood connects that part with the suction-apparatus with whichcarpet-cleaning devices that operate to carry off the dust by suctionare usually connected. Within the inclosed space b are closedcompartments h separated from the space by the partitions h ,h i andextending longitudinally from one end-wall a to the other of the casing.

The inner partition '11 is inclined to the outer partition k atan acuteangle downward tow'ardthe lower edge; and at the angle formed by the twosides of the compartment an elongated or narrow aperture is opens fromthe inclosed space h to theoutside, The mouth of this elongated nozzle70 is flush with the bottom edge of the casing a, and the twocompartments h are so arranged within the casing that their apertures kare inelined at opposing angles from the center towards the sides of thecasing. Openings y in the ends of each compartment connect the interiorspace with a tube or passage in on the outside of the casing, and to thetube w an air-supply tube or hose s is connected by a coupling p.

The hose s for makingconnection between the casing and the source ofairunder pressure, in the' usual manner of operating devices of thischaracter, is of sufficient length to reach from the place where theair-eompressing and exhausting engine is situated, to the place wherethe cleaning device is being operated; and also to allow of the casingbeing moved about over the car pet. The engine and other partsconstituting the complete apparatus that furnishes the air and producesthe suction in the casing are not shown in the drawing and do notrequire to be described, for the reason that the same are well knownparts of similar apparatus already in use and their construction formsno part of my present lower part of this passage b at the moment of itsbeing dislodged from the carpet and when it is at its greatest density"is accelerated and its' discharge is rendered more rapid by applying ajet or stream of air in an upward direction from an elongated slit ornarrow aperture n along theinner side of the casing. This slit It opensinto the passage b from a channel in extending along the lower edgeofthe casing from end to end, and .t is parallel to and conterminous withthe impinging aperture 70. The slit n has an upward inclination for rthe purpose of directing the stream of air in the most favorabledirection for accelerating the upward movement of the dust from thesurface or. locality where it is dislodged by theimpinging jet from theaperture k.

A. conducting passage'3 extending transversely over or through the topof the casing from the coupling p where the passages to are connected tothe opposite sides of the casing, connects the channels m with thesource .of pneumatic pressure through the perpendicular passages 2 onthe inside of the casing. -Through these j passages to the air issupplied to the channels 'm and the nozzles h at the same time. A singlevalve t in the coupling 1) will ordinarily be sufficient for regulatingboth sets of jets'that is the impinging jets delivered against thecarpet through the apertures k, and the upwardly-inclined acceleratingjets from the slits n;

Itwill be noticed inthis construction that the parts it inclose'd' bythe casing have the function of air-nozzles,

operating to deliver jets of air against the surface upon which thecasing is placed and moved along, and-that I I the jets are directed atan angle to such surface by vira space within which the cleaningoperations take place,-

therebypreventing the escape of the dust that is raised by theOPGIatlOII S Of the apparatus into the apartment where the apparatus isbeing used. It will also be observed that the nozzle through which theimpinging jet of air is discharged is arranged along one side of theair-and-dust-conducting passage and that the slitted air channel atthrough which the accelerating jet is discharged arranged along theopposite side of said passage; and that the; nozzle is so constructedand arranged that the air is directed'toward the carpet at an anglethereto and very close to its surface, while the 1 slit in the airchannel m is arrangedto deliver the air in an upward-direction. I preferto arrange two sets of air cleaning nozzles and of accelerating airdischarge slits in asingle apparatus, as shown, and to arrangethenozzles near-the center of the apparatus, while the slits are arrangednear the outside walls of the casing, though this arrangement is notessential to the principle of my invention.

' Having thus described my invention, what I claim and desire to secureby Letters Patent is :1

L In a pneumatic apparatus adapted for the cleaning n carpets, thecombination of a casing arranged to rest directly upon the surface to becleaned and to 'inclose an air space, an elongated nozzle within thecasing arranged to discharge a jet of air downward against the surfaceto be cleaned, an elongated slitted air channel conterminous with thesaid elongated nozzle arranged to discharge a jet of air upward and awayfrom the surface to be cleaned, and means for connecting the said nozzleand air channel with a source of air under pressure,substantially as setforth. 4

2. In a pneumatic apparatus for cleaning carpets, the combination of acasing arranged to rest directly upon the surface to be cleaned and toinclose a space within which the cleaning operations are carried on, anelongated nozzle within the casing arranged relatively near itstransverse central plane and arranged to deliver a jet of air downwarddirectly against the carpet, an elongated. slitterl air channelconterminous with the said elongated nozzle arranged near the side ofthe casing and opposite the said nozzle arranged todischarg e a jetofair upward and in a direction away from the surface to be cleaned, andmeans i for connecting the said nozzle and air channel with a source ofair under pressure, substantially as set forth.

3: In a pneumatic apparatus for cleaning carpets, the combination of acasing arranged to rest directly upon the surface to be cleaned and toinclose within itself an air space, a pair of nozzles arrangedrelatively near the transverse central plane of the casing arranged todeliver jets of air downward against the surface to be cleaned and indirections inclined toward the opposite sides of the casing, a pair ofslitted air channels m arranged along the sides of the casing oppositethe said nozzles to'deliver jets of air toward the nozzles and' in an.upward direction, and means for connecting the said nozzles and airchannels with a source of air under pressure, substantially-as set'forth. In testimony whereof I have hereunto set my name to thisspecification in the presence of two subscribing witnessesl f CHARLES's. BALDWIN.

Witnesses EDWARD E. OSBORN,

ALFRED SAVAGE.

